linux-kernel - [RFC v3 20/24] coredump: drop freezer usage

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Message-Id: <20230114003409.1168311-21-mcgrof@kernel.org>
Date:   Fri, 13 Jan 2023 16:34:05 -0800
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     hch@...radead.org, djwong@...nel.org, song@...nel.org,
        rafael@...nel.org, gregkh@...uxfoundation.org,
        viro@...iv.linux.org.uk, jack@...e.cz, bvanassche@....org,
        ebiederm@...ssion.com
Cc:     mchehab@...nel.org, keescook@...omium.org, p.raghav@...sung.com,
        linux-fsdevel@...r.kernel.org, kernel@...force.de,
        kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Luis Chamberlain <mcgrof@...nel.org>
Subject: [RFC v3 20/24] coredump: drop freezer usage

The kernel power management now supports allowing the VFS
to handle filesystem freezing freezes and thawing. Take advantage
of that and remove the kthread freezing. This is needed so that we
properly really stop IO in flight without races after userspace
has been frozen. Without this we rely on kthread freezing and
its semantics are loose and error prone.

The filesystem therefore is in charge of properly dealing with
quiescing of the filesystem through its callbacks if it thinks
it knows better than how the VFS handles it.

Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
---
 fs/coredump.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/coredump.c b/fs/coredump.c
index f27d734f3102..3a0a5c946bf8 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -459,7 +459,7 @@ static bool dump_interrupted(void)
 	 * but then we need to teach dump_write() to restart and clear
 	 * TIF_SIGPENDING.
 	 */
-	return fatal_signal_pending(current) || freezing(current);
+	return fatal_signal_pending(current);
 }

 static void wait_for_dump_helpers(struct file *file)
-- 
2.35.1